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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '64a03bc0ec7fa8c0f66f34b1e096fb90d4b248326caaffc7cd81478c12d10dde' 
  AND token = 'uyl2jpVqgXHlWAOBW5d+TIqGh14bp3WQVSrquo8K8fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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