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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8f4db6f662588d13ee910e4d116f4396c34bff1e22c5c0ad5d9709d97795f6a6' 
  AND token = 'wRpD7ZQ6RlZQgRH+dg5i9pLkA/gWHu9WUOMwGflNVtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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