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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cd523acedf67849731646f67aa0a2065572053eaec0ec3309f6e7ef2f0a4c7d8' 
  AND token = 'L597XTGGt9gCd7z6bKP3ss3pwQpBswyyxWB/qmoLy9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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