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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7156c544d897984eec2d2ccd49ac1a02d5b0860ff25a732d09295b011d1c9200' 
  AND token = 'w2Hy/2S1BWiqQ/zPtdcvbsbD7CIv/4lS+UrdLR5k2Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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