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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b209404f160119ba41d77802ac21bf4f4329ab1512a76a6687ae1b2c1f9ab368' 
  AND token = 'OyNDsCU+sjlTojqUKmUf57lVEmxZiWMy+8ManU16sDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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