Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d85bee21de3b04b070657a3aaccc68d1b43d21056461d880df94651d63c0d01' 
  AND token = '5lgW8pX7znOmeY80MKvtOirxN3XLLF1IfMOhFo9/hQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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