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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '019cb687b4547cd3031ac2e9a3ffa990b2aa59afdc995a2265f8499c96f2ae2d' 
  AND token = 'HvWjRC65byokaROS6mQF51/qUhqd8uWbTAcuTRcQiCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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