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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b22f3741841164650f9c76fe69e17d680c9f2e5a9a9db69adfc11f1808edd786' 
  AND token = 'Qv/ypD2qR6+tccA3CWbLkqiLaB09+sRGzIizRpBbb/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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