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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1f389908c5509784ba0fc08f8da87334c423274b33d0febced790885a4b8d28c' 
  AND token = 'T9MqNYjBrAsFEm8284/izeGrLRiAhvtNn7jCXdD7jpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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