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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bc3c61b7b439510d42326d490f8f626660cb82a1cae54c3f616085338fa781dc' 
  AND token = '+cx0NO0+F7QXuDW4QdfC779wP1TF4CTKl0TeIxTASps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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