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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '05f50f92eebe1150ff9623f422b5dae7c252005e2b61d16c7e065b963e915e79' 
  AND token = 'f4rq54frM5Qi0eKfCzmELf3OIBqGd1jmQP5puoUzqk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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