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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '587c6aa78a4ab8912ce5f1dea2e24331b09595a12b3baf78ef5c7bb31eaa881f' 
  AND token = 'WdCul8v9I7afmfS6CjjcgZWSjvzEXd4uo9JFREUX9gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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