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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'da8f8e0e8b0b839dbf912c5b24b79663ca287387aa8855e302ae687a3ce32779' 
  AND token = 'FT1CPguTYaPJKcJd3iNq7//MU8GkZeiF3CITnVCNy+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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