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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3b72044a154a07ea3e2cd7ee7584e7cf5a76d9557640ed308037c7ec02b24288' 
  AND token = 'w0OcBtNB5yumxXb7A+InfzCqXe18YBj6E4KgcoEC5To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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