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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0e69befce495277ab2c63f7e08a0510ac806c4f233d6e60ad36e049668703e3a' 
  AND token = '859v+ntg0jxsnDwtFr1pmhpQeELEs3MUYPpvuQ3l/aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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