Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca4a29ba5507b6420b778beb8575371c6a623622729adafca5e0fd00f79a97e' 
  AND token = 'JG8KILpnFdccMcKIc871i+RBuNOV3k5JyHsYVBsVFsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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