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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '699a9f190f9f58fc0e006ff0e0f52a7432d3dfea21097fcc5ccfe48367c3f410' 
  AND token = 'p6l3Rta5ODxW+JXvryWgZ95FTmrj/Prk70R3Lb7XHUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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