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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ab2078e7edef120cd96a7f737bbfa8c63555b9f5dc6214acebfd654f16990b7d' 
  AND token = 'KcGF13dLQMx++eG2ZJAX09zAbuCjUpuoay7p1WdGV4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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