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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c97fcadb0ccfb1b458e08ab1dcdd98e1e3764b8c6d1956a39308bf0e25ce3e94' 
  AND token = 'YoTRvAhcXZ2luX5HN73WEd3FAqDbHOOqrWSSMeBWHho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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