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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ae85d6a986f71f5cd29a29c3a158bbcac198fafd6fd363e709c772c2c4fb7848' 
  AND token = '3uoLFpRvuOpU2QWPVJNWgEOTOl2U88G4074ANePY1wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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