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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '01ca9c430785b047629e1bdb6924c7da5abef48674dedb0e60e77704c4790955' 
  AND token = 'jRree7t5XBwq4avEe3eKe4l196QzMHP6+pQKDZ15eCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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