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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'acd5e258f8f51b471d728ac818a8413ce95326ba351aabbfc4bf39667444e6ad' 
  AND token = 'AkxcQgfOu4sKsLRtYKD2ffPOY08ImQFEARD//zbWvV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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