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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd1394127b7a5b3ca1ad1baeb7d25e30a062d758cf7220813aad3030710c02b10' 
  AND token = 'zYxV79jDlSC0OWz29gTwHZNBaDya0cP1+L2rUTAvhH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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