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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4ef3399e36f8693a1dfafce0b822a592b46dc592f33f48f28b01dbaba0b4e472' 
  AND token = 'EBdtgVKVOG40uRwNuv4ZZAoeeTk0snxrqbQcegdeW70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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