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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '80eae4e087a05af42cfa14ab104ac03dd3a5e55579cf99b0a615c5a9b636c3f5' 
  AND token = '0gkr7uZH21QNCVYfg74uxVIr4X/KRWqtWY0hgSH0XdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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