Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b051feffdb614cc199cab81ab3710dc73d0a9dd890cb9a7f1ae6de8a65c9fe' 
  AND token = 'bsmvS0l1EEYhjC4Gdt7MddP/UAHa016kFiSHKqp+rB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}