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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '70e835b8f76b43d7d1677628c1ddd6b05ff7a643c364012569b47b14e1dc1d18' 
  AND token = 'd0qKW+gwIze8o34csZ9UkSWlQBoluna6KTXx74HAa+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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