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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a7a1e3d597732400e005f4fa2abfaca44d3c88b72e4ea35519e6bc56ac4813fc' 
  AND token = 'n4SMKuy4dPWsxuVzyzm6P8tezRYNpUIGoqjce45bwNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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