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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f41bba14a7b22131ecdbee21a8c793eb5390efecadf3fcb82ac176264c7d8f0a' 
  AND token = 'THDeq3R42aB7iqURyanDRtvb9oKA6NAMbVRVh8Vqfyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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