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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8516beb5a37bdd1f85207e9e4bbbd5f53cee5ba0b8c8bfa2ab1457d0752d2c5d' 
  AND token = 'ljqwDJ0Sdbe+vqpAX6Uj6vdHfcyPIDHU4P8dj1yEYXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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