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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c8f964dc53f98e1f789490ddfbee71d8c7f1c00d709c0d4bec7518a88de771b8' 
  AND token = 'hZT+tny28Xvpn7imOJUYdLps+ckflLxL19MipqGJoV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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