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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f4a9a720dfbf3e7f2e2bb103fb2c9317efbf6951a73786d8bfaf6e3efaa5a99f' 
  AND token = '3idimeMDh1/HqKfSd1t2CPnio9sxMu/9j0nyXUr+WvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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