Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b2611f24058f1ef1a6a9d98452140000e7a1f2e6819bf228dfa7b7e1eed345e9' 
  AND token = 'Fj0b2TQ0JYKdekvF3OGq490TSuWv4mhp2gQuRKbTWtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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