SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b11bfbc544841d3cdbb8fadd40980d6eeee19d62513b3cff4211682dc882ce40' 
  AND token = 'lmzQ2qKg7IJsPf4U4qCnJbvG8JoFKcLGeIiVRbDPhWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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