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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8efda59c7b78175e40957ebda13be1e47ffa426347cde33526305b2c2ae6e733' 
  AND token = 'o8alomUhGzIgnGbFsu8Tg1DDcllIVdNz1nEp8xUQANw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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