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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6cdbffb4096a67ac1968ab705aaa670213a0a71a843583ab89f36804b49f4ff8' 
  AND token = 'NWH3J5NdMOngSwPiXWMgwM9H6y+qFgffi3Yawq8PAYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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