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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fd8b0d3aaa664b3a067bed59d76e35a4b6d04efe542cc2f6c3184072e395ea06' 
  AND token = 'pKydWe4W5NKOr/5ucfLqmMwDefT/XrNVlCvkV73R6lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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