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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '504f88d33d0732b92b314a422dd4b048208aee129492d8f53fbe78d29f671801' 
  AND token = 'ZdxhXmb94xCXlnlxYrZaRIy44eQEZFyws5Q1XdCpkvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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