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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3c4c05eaf6311ea6551a17d780c284c9ad70ec6d0e83e63b59aa9fe84250f7a6' 
  AND token = 'CSrEW3yKCwYAHHrRkSEzewBN2Tq/+oCr39fQcdg5lqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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