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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '53477454a378149a973106704175d4ce0e74bd8e0a933857b8072f1b0c2206f1' 
  AND token = 'UKsp/5xtmTFTghPQqcgR8jT4T9fk88nS9bQRyCvfuDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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