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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '87efaadc7cfdee68404b0a87e58db82d49ddd3956ac245866d3957bf8734562f' 
  AND token = '7ifyykuV9w/uYpuB2Wyrs3DVC2+XOYw+mbdW75+kXo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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