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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c934db600af96e35007e8cbbd2584bd7665fcc5b55cb6df2aadf75a3084ee3c9' 
  AND token = 'j6KHAexIhcWWrtgmy8Koxt2HvtX23cB6qSElR1lq+JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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