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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '79827a9c18789655e274f794baa2c9df7de29786b71805eae8bd361c76672577' 
  AND token = '7cqd+dSgd/WWP3OBWs/+ahXQEWbapkqrFbdPMFC1kv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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