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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b92fb16ecaebf6dcae36a4bef6f5d245d72a9f6ea6713aae92a8724dae888035' 
  AND token = 'zsGeq7jotYoaspE2hUKoSpYGrOFtg1yHBCEBxbEECvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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