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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c4b5fe75322a2931b3ca5012e37f427be86f1caec533162a864961d1d7a54e38' 
  AND token = 'hXlGDYajBmZ4Paw1FnmmaC14hjznKt2xTmt3qG2ZcCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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