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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9db1233e44ff1bf03d4e315499ad2ca973fb7ccfe4793edd8d5be3af0581df9e' 
  AND token = 'HQhwPNUkslNpvuXH7P+jt9oSVFI1xYknJRcExXiOMA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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