SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd41352cc77b2c8c292890b02ae7865159cf553a718f76857f30b85465e84c1ef' 
  AND token = '+YB9fEdFJzTmYjBtHRdl4woIz2jPrX1u3z/wzKEEiXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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