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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '481fb0aae7482c34d5d889f2e8febf0924ad3da5a33bb83a9145774541a697d5' 
  AND token = 'olhI0nytTxov6fdNQcMnJ6eKQtqTSqMNveJ5yfpw3bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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