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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6614739ed46e115f38f77dc880477a0558af55a9b7c98147d4c2e4a96b5e268f' 
  AND token = '+oyRKpKfOcpeuCxkQeLuN+Ew2mqYOZ+24GTysnXAmw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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