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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '785e76ee428b4e9407422e10ed302db129888efbcc81f41106e9f81e533f2462' 
  AND token = 'XDVYGbezWKmjYqybWkO2kb/ripqH0UZqfR8FMIi4uSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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