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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'da024198b164b666677f88d8d60e6c7acbb02e7259eb06d600771ec90849bbae' 
  AND token = 'WAMI79lJMfvwJx5lccbnRBr01MNd+e+lhYca0CTKkXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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