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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '525f54d6f16e1a4ce0ece49a479b3edc4a4139936bfa46986508d4701f3f38ad' 
  AND token = 't1m3nG/3D8y9nN7ws/6f/xH147CI9OLYi5hKTIPltH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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