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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a0bddeec528a91b77975b92984cf06ef491bdff9b18e026b016b6255276777ec' 
  AND token = '5rXj5RqWJb/RCG+BDYclU1t0pSxo6aZ10KnpnK9Qs9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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