SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '87e1ecf0b5eff1b09139da7c7bb1b76d27a5fb83b21686fdc4b9c79066acea28' 
  AND token = 'WlyXgfr8ZtlpH4rrX/nn20c3B6pjhgdv4u3JTaGYctw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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