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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1e896533d06edaa2f6786e3cfb8c9a880f337d5617b409740aadf500b9c8a863' 
  AND token = 'Lw4cPZ6jfy1ekpaKrkbTfn49hgNiqXsJ5t3jrT+dYO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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