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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bbb05c5cee670f6436e90b00c979be9be321a445ceb728fb02f832af6432961a' 
  AND token = 'VXbUBun4OV/CrF3JIzZUcImSQ7AzjA4s8cXq3Id896M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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