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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ff264e4d7671a144defaf395fe5b7f085cf51dd63c924c38119f8a7a7082c5d6' 
  AND token = 'p48PMn98c10kBAyxxdr76WgJ/j0vNDL0X2K9WgInBV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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