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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6b36d4c346233b022d429b638ecfb595c37e04018ef9c3a20212c541d47c7b3d' 
  AND token = 'yEQ23C8dMklnlTo7g3g3777JoNJhJFYk+jOQgAvwMqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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