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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '91727e559c266c2420f27e111383f5cc544a45c3b59878386467b1bb711944a4' 
  AND token = 'ud6XiLKs9a8Bn9UsvIkjHHHbfOFNzYiZOzKDreNtRg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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