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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '061df91ea1653d44b9ca0d35b0f8372ba6e9588ab94c40f9c94f3e0cef308c8b' 
  AND token = 'M1R5Bepsg5scPxtkCHHJ3QYGJSpHgqcVYaBvSOb6MSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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