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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd58803f0ddecd354787535698908adc1215667e0e1c9c781269d075ccc9a0844' 
  AND token = 'Gm1Fcbx5PRShp8tX/KaZGuiqrgUi1bJwxZPupqPS5JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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