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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c13183baf2d18a00f61b8c8ef508b76b490952b12aa003d04325d9e09b79d2ba' 
  AND token = '83FKQcaaaxYkbnfSTd7gqgr9Nsks6cfvaPGsgaV7XlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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