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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bf1b51f9365bcc9cdc4d4318d63cc749062a410fe4f41d84582242b4927bfe23' 
  AND token = 'R9+NVe46UNLvbJeICbVWhk0GCxB2F4mzMxxe2raluww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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