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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2a94c91a04e9279dcae3df49d8ba14c3ad6b30cf789dca5bb3bfd8e3b844cbfb' 
  AND token = 's5zAKqI8vXdqwYWUSaY7HTtzdu3d8f4QQ3BW4tS5mMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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