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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a4797529e53a221f41e571f91c46db7d81abbb0fc11cceb01d0ad2b362095711' 
  AND token = 'xsLfVijGj/zabsD1DjM+d5N5877uVAa/q4RFK/1NdZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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