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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '044cf81e2801b6c96609240c20f96596f2d5fa7d4bf45633f26f0ab0862ee4fe' 
  AND token = 'LSCUidkPEBooHpZs1rrntHRgW9iThK6N3Ox/5vWJrKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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