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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a33cb4072be904079c08736c1ca2e04badc0d648556e63511761fdbbd2617924' 
  AND token = 'Ec+v0dg6adr5N+fMCj1kdJwfpdxfjKZUVfrUfEG7Z34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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